Bad day of mudding-engine light problem - JeepForum.com
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Unread 08-13-2013, 07:41 PM   #1
taylormackayers
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1997 TJ Wrangler 
 
Join Date: Jun 2013
Location: calgary, alberta
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Bad day of mudding-engine light problem

A couple days ago I went out mudding in my stock 97 Jeep TJ 4 cylinder 2.5l and went through 6-8 puddles in a row and they only came up about half of my rims but then when I got out onto the main trail my jeep stalled even though my foot was on the clutch. I played around with it until it would stay running then later went on the highway and my engine light came on. Also it still felt like it was going to stall and became really jerky when i was starting off going or if my foot was pressed most of the way down on the gas. I checked the engine light issue and it gave me 3 codes. P0121, P0123 and P0303. The P0303 says there was a cylinder 3 misfire detected so I changed all my spark plugs today because they needed to be done anyways but the issue is still the same. The P0121 code involves the Throttle position sensor range and performance and the other is the TPS sensor high input circuit. I have no experience with the TPS unit, don't know what it looks like or where it is located. Wondering if anyone else had this same issue and could offer some much needed advice.

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Unread 08-13-2013, 08:06 PM   #2
Majnoon
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2000 TJ Wrangler 
 
Join Date: Aug 2012
Location: Springfield, Missouri
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If it were mine I would disconnect the battery (removes codes, makes engine relearn) disconnect the TPS soak it and the connector with electronic safe silicone lubricant. Like used on weather seals and grommets. Theory being water got in there. Not an expert never seen it happen, just what I would try. Edit:
It's a black plastic thing on the throttle body. Thats the thing the throttle cables and air intake hook to. Just realized you needed location of TPS. ( throttle position sensor)
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Unread 08-13-2013, 08:15 PM   #3
wrangler2
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2002 TJ Wrangler 
 
Join Date: Apr 2012
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Disconnect the battery for a few minutes then reconnect. So the sensors and communications can reset... (Remember radio preset the reset FYI)

Your prob not dealing with anything big here. When it comes to throttle body cleaning etc... It's simple.

-War is sweet to those not experienced in it.- 09-12
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Unread 08-13-2013, 08:57 PM   #4
Scott_98TJ
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1998 TJ Wrangler 
 
Join Date: Oct 2005
Location: Lexington, KY
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I've made pretty fast runs down an old rail bed road with loads of puddles and bumps. Eventually my gauges go crazy and check engine light comes on. Just dry it out. Pop your distributor cap off and make sure it's dry inside. You'll be fine. If you don't have a code reader to clear the codes then do as said above and remove batt cable.
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Unread 08-14-2013, 02:28 PM   #5
taylormackayers
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1997 TJ Wrangler 
 
Join Date: Jun 2013
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I tried everything suggested above with no success so i went out and bought a new tps unit and replaced it, started her up and nothing changed it's still running like crap
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Unread 08-14-2013, 04:17 PM   #6
Scott_98TJ
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Quote:
Originally Posted by taylormackayers View Post
I tried everything suggested above with no success so i went out and bought a new tps unit and replaced it, started her up and nothing changed it's still running like crap
Did you clear the codes? Any new codes pop up? Did you crack your distributor cap? Put the plug wires on wrong? I'd keep it simple for now.
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98 TJ 4.0L | GenRight Stretch, 4 Link | Built XJ HP30 & XJ 44 | AW4 | ARB's | 35" Krawlers | Allied Beadlocks | York OBA | Warn 9500i etc. | M416 Trailer

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Unread 08-14-2013, 04:41 PM   #7
peicherokee
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2000 TJ Wrangler 
 
Join Date: Mar 2009
Location: , PEI
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Did you get after market or oem tps replacement, i ask because when I got mine I got aftermarket and I went through a few of them before I found a good one..
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Unread 08-14-2013, 05:31 PM   #8
taylormackayers
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1997 TJ Wrangler 
 
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Location: calgary, alberta
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I just got an aftermarket on I am going to take it back and try an OEM
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Unread 08-14-2013, 05:36 PM   #9
Toby36
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1998 TJ Wrangler 
 
Join Date: Jul 2010
Location: Lafayette, IN, Lafayette, IN
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yes i wnt through two tps sensors before i got a good one. it might not be the sensor anymore though if it is still misfiring. also before you hook up the sensor unhook the battery so code clears before the new one is plugged in that way it will relearn properly
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Unread 08-14-2013, 09:05 PM   #10
Majnoon
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2000 TJ Wrangler 
 
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Location: Springfield, Missouri
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Unhook it for 10 minutes at least. If the check engine light is still on immediately after unhooking it wasn't long enough.
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